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The Subgeneric Classification of Clematis (Ranunculaceae) in Temperate North America North of Mexico

Carl S. Keener and W. Michael Dennis
Taxon
Vol. 31, No. 1 (Feb., 1982), pp. 37-44
DOI: 10.2307/1220586
Stable URL: http://www.jstor.org/stable/1220586
Page Count: 8
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Abstract

Within North America north of Mexico, Clematis (Ranunculaceae) consists of 30 native or introduced species which are classified into four subgenera, viz., Clematis (9 species), Atragene (L.) Torrey & Gray (2 species, Viorna A. Gray (17 species), and Viticella (Moench) Keener & Dennis, stat. nov. (2 species). In particular, the history of the names "Atragene" and "Viorna" is reviewed with special attention to the major infrageneric rank (subgenus) in Asa Gray's publications.

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